Dale, borers do not occupy the soil around the tree. The adults lay eggs in the bark of the tree. Maples in stress ( lack of water) or damaged by disease, physical abuse, weather damage etc. are particularly vulnerable. I would contact a local certified arborist for recommendations on varieties that may be more resistant as well as treatment should they attack. Products labeled in Michigan may not be labeled for use in Maryland. Best And Happy Yardening, Nancy.